I bought this drive because I am going to New Zealand for a 4 week holiday, and wanted to be able to back up my photos: I shoot in RAW format, which produces files 4 or 5 times as big as jpg (i.e. about 20 MB each), and I was afraid they would fill my iPad if I used that as a backup.
The drive is well made, but its instructions are poor (you can download a manual from the manufacturer's website, but this isn't well written, and sometimes seems to conflict with the Quick user guide leaflet provided). It's not immediately clear that you need to download a Client program for your computer, as well as an app for the iPad from the App store, but when I had got all that sorted out, I was able to get everything working (you need to add the device's own wifi network to your computer and iPad, or it will not be recognised).
All this took me a couple of hours, but it was very satisfying to be able to see the device from my other devices, and download/upload files. And this was when I discovered that, when I tried to transfer photos from my iPad it would only handle the jpg files - it wouldn't even recognise the RAW files. In fact there is quite a long list of file types it *will* recognise, but it seems that anything not on that list cannot be transferred (or even seen). You can see the list on the manufacturer's website ([...]
I emailed the manufacturer and had a quick response, suggesting that I could set my camera to shoot in jpg - which of course is not a satisfactory solution.
So, in short, if you only want to be able to store the file types that the device recognises, it would rate 5 stars. For me, it is virtually useless (though my wife will be able to use it, as she uses jpg), so I am afraid 3 stars is generous.